* {
  margin: 0;
  padding: 0;
  text-decoration: none;
  /* font-family: "Ubuntu",sans-serif; */
  box-sizing: border-box;
}

.navbar {
  position: fixed;
  background-color: transparent;
  width: 100%;
  padding: 30px 0;
  top: 0;
  z-index: 999;
  transition: .3s linear;
}

.inner-width {
  max-width: 1300px;
  margin: auto;
  padding: 0 40px;
}

.navbar .inner-width {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  width: 125px;
  height: 50px;
  background-image: url(../images/logo.png);
  background-size: contain;
  background-repeat: no-repeat;
}

.menu-toggler {
  background: none;
  width: 30px;
  border: none;
  cursor: pointer;
  position: relative;
  outline: none;
  z-index: 999;
  display: none;
}

.menu-toggler span {
  display: block;
  height: 3px;
  background-color: #fff;
  margin: 6px 0;
  position: relative;
  transition: .3s linear;
}

.navbar-menu a {
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  margin-left: 30px;
  transition: .2s linear;
}

.navbar-menu a:hover {
  color: #48dbfb !important;
}

.sticky {
  background-color: #fff;
  padding: 18px 0;
}

.sticky .logo {
  background-image: url(../images/logo.jpg);
}

.sticky .navbar-menu a {
  color: #111;
}

.sticky .menu-toggler span {
  background-color: #111;
}

#home {
  height: 100vh;
  min-height: 500px;
  background: url(../images/background1.png) no-repeat center;
  background-size: cover;
  background-attachment: fixed;
}

#home .inner-width {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
}

#home .content {
  width: 100%;
  color: #fff;
}

#home .content h1 {
  font-size: 60px;
  margin-bottom: 60px;
}

#home .content h1::after {
  content: "欢迎使用寻路算法三维可视化交互平台！";
  animation: textanim 10s linear infinite;
}

@keyframes textanim {

  25% {
    content: "Greedy";
  }

  50% {
    content: "Dijkstra";
  }

  75% {
    content: "A*";
  }
}

#home .buttons {
  margin-top: 60px;
}

#home .buttons a {
  display: inline-block;
  margin: 15px 30px;
  color: #48dbfb;
  font-size: 15px;
  font-weight: 500;
  width: 180px;
  border: 1px solid #48dbfb;
  padding: 14px 0;
  border-radius: 6px;
  transition: .2s linear;
}

#home .buttons a:hover,
#home .buttons a:nth-child(2) {
  background-color: #48dbfb;
  color: #fff;
}

section {
  padding: 100px 0;
  background-color: #f1f1f1;
}

.section-title {
  text-align: center;
  margin-bottom: 80px;
  position: relative;
  font-size: 26px;
  padding-bottom: 20px;
  color: #111;
}

.section-title::before {
  content: "";
  position: absolute;
  width: 80px;
  height: 3px;
  background-color: #111;
  bottom: 0;
  left: calc(50% - 40px);
}

.section-title::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 10px;
  background-color: #48dbfb;
  border: 4px solid #f1f1f1;
  left: calc(50% - 12px);
  bottom: -7px;
}

.about-content {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.about-pic {
  width: 200px;
  border-radius: 50%;
  margin-right: 100px;
}

.about-text {
  flex: 1;
}

.about-text h3 {
  margin: 10px 0;
  color: #444;
  font-size: 16px;
}

.about-text h3 span:nth-child(1):after,
.about-text h3 span:nth-child(2):after {
  content: "";
  width: 6px;
  height: 6px;
  background-color: #444;
  display: inline-block;
  border-radius: 50%;
  margin: 0 14px;
}

.about-text p {
  font-size: 17px;
  text-align: justify;
  line-height: 26px;
  margin-top: 20px;
}

section.dark {
  background-color: #2b3956;
}

section.dark .section-title {
  color: #f1f1f1;
}

section.dark .section-title::before {
  background-color: #f1f1f1;
}

section.dark .section-title::after {
  border: 4px solid #353b48;
}

.services {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.service {
  width: calc(33% - 20px);
  text-align: center;
  border: 1px solid #48dbfb;
  border-radius: 6px;
  margin: 20px 0;
  padding: 40px 20px;
  color: #fff;
  cursor: pointer;
  transition: .3s linear;
}

.service .icon {
  color: #48dbfb;
  font-size: 40px;
  margin-bottom: 20px;
  transition: .3s linear;
}

.service h4 {
  font-size: 16px;
  margin-bottom: 6px;
  color: #fff;
}

.service p {
  color: #fff;
}

.service:hover {
  background-color: #48dbfb;
}

.service:hover .icon {
  color: #fff;
}

.services-text h2{
  margin: 10px 0;
  text-align: center;
  font-size: 28px;
  color: #fff;
  
}

.services-text h3{
  color: rgb(13, 214, 254);
}

.services-text p {
  font-size: 17px;
  text-align: justify;
  line-height: 26px;
  margin-top: 20px;
  color: rgb(189, 220, 223);
}